books.google.co.uk - Written by the world-renowned pioneer in the field of modern sociolinguistics, this volume examines the cognitive and cultural factors responsible for linguistic change, tracing the life history of these developments, from triggering events to driving forces and endpoints.Explores the major insights...http://books.google.co.uk/books/about/Principles_of_Linguistic_Change_Cognitiv.html?id=uwMTUk4g2IoC&q=divergence&utm_source=gb-gplus-sharePrinciples of Linguistic Change, Cognitive and Cultural Factors